We have had both bantam and standard roosters for decades, and no issues that couldn't be managed. As in, selecting cockerels who could get along with everyone, and being ready to remove cockerels or roosters who caused problems. There's a difference between a peck or two when sorting out 'who's on first', and continued actual battles. Our flock was inside for months this year because of AI, with four roosters, and zero injuries. Now that they are outside during the day, each has a group of ladies, and go in different directions so they aren't in each others' way.
Mary
Mary